An icosaheron polyhedral or spherical with fivefold, threefold, and twofold axes of rotational symmetry is defined as having 532 symmetry read as 5,3,2 | This symmetry and number of capsomeres is typical of all members of the adenovirus family |
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A Preparation of primary cells | Virus capsids can be classified as naked icosahedral, enveloped icosahedral, enveloped helical, naked helical, and complex |
Single-stranded, positive-sense RNA viruses include five families: Togaviridae, Flaviviridae, Picornaviridae, Tetraviridae, and Nodaviridae.
4Three or 2 structural proteins make up the papovavirus capsid: in addition, 5-6 nonstructural proteins are encoded that are functional in virus transcription, DNA replication and cell transformation | Virus can either have an envelope or not |
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, hepatitis B virus or the members of the picornavirus or parvovirus family, are orders of magnitude more resistant than are the larger complex viruses, e | In addition to classification as flexible or rigid and as naked or enveloped, helical nucleocapsids are characterized by length, width, pitch of the helix, and number of protomers per helical turn |
The most obvious difference between members of viral families is their morphology, which is quite diverse.
13Development of a sensitive diagnostic assay for fish nervous necrosis virus based on RT-PCR plus nested PCR | A virus family may consist of members that replicate only in vertebrates, only in invertebrates, only in plants, or only in bacteria |
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OpenStax College, Organizing Life on Earth | The agents causing transmissible subacute spongiform encephalopathies have been linked to viroids or virinos i |
OpenStax College, Organizing Life on Earth.